It's actually really easy.
You remove your gauge cluster from your car.
remove the needles. (take a picture beforehand for reference)
Peel off the original face.
Stick the new face on. (it comes baked with 3M adhesive and mounting holes that the originals have)
place needles back in correct location. (look at your reference pic)
Place the cluster back in the car.

Bada-boom, bada-bing, you're done! I think I did all 3 in less than 20 minutes. Just peel off old faces, and stick on the new ones.